hdu 1042 N!(大数的阶乘)

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 55659    Accepted Submission(s): 15822


Problem Description
Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!
 

 

Input
One N in one line, process to the end of file.
 

 

Output
For each N, output N! in one line.
 

 

Sample Input
1 2 3
 

 

Sample Output
1 2 6
 
这个题目就是一个大数的乘法,不难,但是半年前的我写这个题目的时候写了很长很长的代码 麻烦的很 花了很久才过的  ,现在想起来就重新写了一遍 代码精简了好多,而且也美观了很多 ,哈哈 事实证明我这半年还是有进步的  O(∩_∩)O!
 
 1 #include<iostream>

 2 #include<cstdio>

 3 #include<cstring>

 4 

 5 using namespace std;

 6 

 7 #define ll long long

 8 

 9 int num[80000];

10 

11 int main()

12 {

13     int n;

14     while(~scanf("%d",&n))

15     {

16         memset(num,0,sizeof(num));

17         num[0]=1;

18         int pre=0;

19         int len=1;

20         for(int i=2;i<=n;i++)

21         {

22             pre=0;

23             for(int j=0;j<len;j++)

24             {

25                 num[j]=num[j]*i+pre/10;

26                 pre=num[j];

27                 num[j]%=10;

28             }

29             while(pre>9)

30             {

31                 num[len]=pre/10%10;

32                 len++;

33                 pre/=10;

34             }

35         }

36         for(int i=len-1;i>=0;i--)

37         printf("%d",num[i]);

38         printf("\n");

39     }

40     return 0;

41 }

 

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